Anti-fall device for a window sash

ABSTRACT

An anti-fall device for a window sash comprises a window-sash fixing block, a window-frame fixing block, an elastic metal wire and a pipe. The elastic metal wire connects the window-sash fixing block and the window-frame fixing block. The window-sash fixing block is defined with a through hole into which the pipe is inserted. One end of the elastic metal wire is connected to the window-frame fixing block, and the other end of the elastic metal wire penetrates the through hole in the window-sash fixing block and enters the pipe. The end of the elastic metal wire, which penetrates the through hole, is fixed with a limiting block. The diameter of the limiting block is bigger than that of the through hole. The window-sash fixing block is fixed on the window sash, and the window-frame fixing block is fixed on the window frame.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a casement window, and moreparticularly to an anti-fall device for a window sash of a casementwindow.

2. Description of the Prior Art

Commonly, a casement window consists of a window frame and a windowsash. The window sash is connected to the window frame by hinge orlinkage rod structure, so that after a long time of use, the connectingparts will rust or loose to fall off, thus causing the window sash tofall off. Therefore, such a casement window has the disadvantage such aslow safety.

In order to solve the above problem, conventionally, a chain or a steelcord is provided to connect the window frame and the window sash, sothat if the window sash releases from the window frame, the chain or thesteel cord can pull the window sash for avoiding the fall-off of thewindow sash, thus improving the safety. However, such a connectingstructure such as the chain or the steel cord is directly exposed, so itsuffers from the disadvantages such as lack of aesthetic feeling,obstructing the opening of the window sash, easy to rust and rupture,etc.

SUMMARY OF THE INVENTION

The primary objective of the present invention is to provide ananti-fall device for a window sash, which is embedded type, when thewindow sash is closed, the steel cord which connects the window frameand the window sash will enter the pipe, and the whole device will hidebetween the window frame and the window sash. When the window sash isopened, the steel cord will be pulled out of the pipe with the windowsash, thus solving the problems caused by the exposed chain or the steelcord.

In order to achieve the above objective, the anti-fall device for awindow sash in accordance with the present invention is connectedbetween the window sash and the window frame and comprises a window-sashfixing block, a window-frame fixing block, an elastic metal wire, and apipe. The elastic metal wire connects the window-sash fixing block andthe window-frame fixing block, the window-sash fixing block is definedwith a through hole into which the pipe is inserted, one end of themetal wire is fixed to the window-frame fixing block, and the other endof the metal wire is inserted into the pipe through the through hole ofthe window-sash fixing block and fixed with a limiting block, thelimiting block has a diameter greater than a diameter of the throughhole.

The window-sash fixing block is fixed on the window sash, and thewindow-frame fixing block is fixed on the window frame.

The window-sash fixing block is defined with the through hole into whichone end of the pipe is inserted, and the other end of the pipe is fixedon the window sash.

The window-sash fixing block is defined with the through hole, which isformed with an expanded end, a diameter of the expanded end is biggerthan that of the through hole in the window-sash fixing block, and thepipe is inserted into the expanded end.

The elastic metal wire is a steel cord or a steel wire.

The present invention has the following advantages: high safety, simplestructure, low cost, convenient to install and use, etc.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a casement window in accordance with thepresent invention;

FIG. 2 is a perspective view illustrating the open state of the casementwindow of FIG. 1 in accordance with the present invention;

FIG. 3 is a partial view of FIG. 2, illustrating that the structure andthe installation sate of the connecting device in accordance with thepresent invention;

FIG. 4 is a schematic view of a window-frame fixing block of FIG. 3 inaccordance with the present invention;

FIG. 5 is a schematic view of a window-sash fixing block of FIG. 3 inaccordance with the present invention; and

FIG. 6 is an exploded view of the anti-fall device for a window sash inaccordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be clearer from the following descriptionwhen viewed together with the accompanying drawings, which show, forpurpose of illustrations only, the preferred embodiment in accordancewith the present invention.

Referring to FIGS. 1-6, an anti-fall device 5 for a window sash inaccordance with the present invention comprises a window-frame fixingblock (made of metal) 52, a window-sash fixing block (made of metal) 54,a pipe 51, a steel cord 53.

The window-frame fixing block 52 and the window-sash fixing block 54each are defined with a through hole 523 in the same direction. Each ofthe through holes 523 is defined with an expanded end 522. In addition,the window-frame fixing block 52 and the window-sash fixing block 54each are defined with two screw holes 521. The screw holes 521 arelocated in the middle of each of the blocks 52, 54, and the through hole523 is located close to one side of each of the blocks 52, 54. Thelength of the steel cord 53 is determined according to the openingdegree of the window sash 2. The steel cord 53 is inserted through thethrough holes 523 of the window-frame fixing block 52 and thewindow-sash fixing block 54, and then both ends of the steel cord 53will be fixed to two limiting blocks 531 which are engaged in theexpanded ends 522 of the through holes 523. The opening of the expandedend 522 in the window-sash fixing block 54 will be sealed to retain thelimiting block 531 therein, and the pipe 51 is inserted in the expandedend 522 in the window-frame fixing block 52. The upper end of the pipe51 is flatly sealed and defined with a fixing hole 511. The window-framefixing block 52 is fixed on the window frame 1 by screw to fix the pipe51 on the window frame 1 synchronously, and the window-sash fixing block54 is fixed on the window sash 2. At this moment, the steel cord 53 willconnect the window frame 1 with the window sash 2. In order to connectthe fixing blocks 52, 54 to the window frame 1 and the window sash 2firmly, the other side of each of the window frame 1 and the window sash2 is further provided with a clamping board in such a manner that theclamping boards and the fixing blocks 52, 54 can clamp both sides of thewindow frame 1 and the window sash 2. Alternatively, the window-framefixing block 52 can also be fixed on the wind sash 2, and thewindow-sash fixing block 54 and the pipe 51 can also be fixed on thewindow frame 1.

The steel cord 53 can also be substituted by other materials that have acertain strength and elasticity.

When the window sash is closed, the upper end of the steel cord entersand hides in the pipe. When the window sash is opened, the steel cord ispulled out of the pipe, so that once the window sash falls off, thelimiting block at the end of the steel cord will be blocked in thethrough hole in the window-frame fixing block to pull the window sash,thus preventing the window sash from falling off.

While we have shown and described various embodiments in accordance withthe present invention, it is clear to those skilled in the art thatfurther embodiments may be made without departing from the scope of thepresent invention.

What is claimed is:
 1. An anti-fall device for a window sash beingconnected between a window sash and a window frame and comprising awindow-sash fixing block, a window-frame fixing block, an elastic metalwire, and a pipe, characterized in that the elastic metal wire connectsthe window-sash fixing block and the window-frame fixing block, thewindow-sash fixing block is defined with a through hole, the pipe isinserted in the through hole in the window-sash fixing block, one end ofthe metal wire is fixed to the window-frame fixing block, and the otherend of the metal wire is inserted into the pipe through the through holeof the window-sash fixing block and fixed with a limiting block, thelimiting block has a diameter greater than a diameter of the throughhole, wherein when the window sash is closed, the upper end of the steelcord enters and hides in the pipe, when the window sash is opened, themetal wire is pulled out of the pipe.
 2. The anti-fall device for awindow sash as claimed in claim 1, characterized in that the window-sashfixing block is fixed on the window sash, and the window-frame fixingblock is fixed on the window frame.
 3. The anti-fall device for a windowsash as claimed in claim 1, characterized in that the window-sash fixingblock is defined with the through hole into which one end of the pipe isinserted, and the other end of the pipe is fixed on the window sash. 4.The anti-fall device for a window sash as claimed in claim 1,characterized in that the window-sash fixing block is defined with thethrough hole, which is formed with an expanded end, a diameter of theexpanded end is bigger than that of the through hole in the window-sashfixing block, and the pipe is inserted into the expanded end.
 5. Theanti-fall device for a window sash as claimed in claim 1, characterizedin that the elastic metal wire is a steel cord.
 6. The anti-fall devicefor a window sash as claimed in claim 1, characterized in that theelastic metal wire is a steel wire.